Shutter for moving-picture machines.



A. D. STANDEFORD. SHUTTER FOR Movme PICTURE MACPINES.

APPLICATION ELLED 0023,1914.

1 l 5 ,887 Patented Feb. 13, 1917.

2 SHEETS-SHEET1.

"R fqggllllllllllllli WITNESSES: INVENTOH inside]. Kid/21507 5,

A. D. 'STANDEFORD.

SHUTTER FOR MOVING PICTURE MACHINES.

APPLICATION FILED 0m. 3. 1914.

1,21 5,887, Patented Feb. 13, 1917.

2 SHEETS-SHEET 2- ARCHIE D. STANDEFORD, OF KANSAS CITY, MISSOURI.

SHUTTER FOR MOVING-PICTURE MACHINES.

Specification of Letters Patent.

Patented Feb. 13, 1917.

Application filed October 3, 1914. Serial No. 864,780.

To all whom it may concern: j

Be it known that I, ARCHIE D. STANDB- rono, a citizen of the United States, residing at Kansas City, in the county of Jackson and State of Missouri, have invented certain new and useful Improvements in Shutters for Moving-Picture Machines, of which the following is a specification.

My invention relates to improvements in shutters for moving picture machines, and the object of the invention is to provide a shutter having blades which may be expanded or contracted for the purpose of controlling the degree of light projected upon a screen, causing the moving pictures to be displayed more distinctly and with less strain on the eyes than heretofore, by eliminating the flicker occurring under the many di'r erent conditions of projection.

In order that said invention may be fully understood, reference will now be made to the accompanying drawings, in which:

Figure ,1 is a broken front elevation of a moving picture machine provided with my invention.

Fig. 2 is a plan View of the same.

Fig. 3 is a cross section, enlarged, on line III-III of Fig. 2.

Fig. 4 is a longitudinal section, enlarged, on line IVIV of Fig. 2.

Fig. 5 is a detail perspective view of a grooved sleeve employed in carrying out the invention. 7

Fig. 6 is a perspective View of a shifting bar constituting part of the invention.

Fig. 7 is a side elevation of a bushing adapted to fit into one end of the grooved sleeve.

Fig. 8 is a broken side elevation of one of the blades of the shutter.

Fig. 9 is a plan view of the part disclosed by Fig. 8.

Fig. 10 is adetail side elevation of a shifting collar for actuating the shifting bar disclosed by Fig. 6. g

A designates a moving picture machine of any ordinary or preferred form provided with the customary projecting lens B, and

' the shutter shaft C. so 1 designates the adjustable shutter conlstituting an important feature of the present invention.

Said shutter consists of a wide blade 2, and two comparatively narrow blades 3 and 55, 3. The narrow blade 3 consists of a pair of members l and 4 arranged to move in opposite directions to enlarge or contract said blade 3, as will hereinafter appear. The narrow blade 3, also consists of a pair of members 4 and l", arranged to move .in opposite directions to enlarge or contract said blade 3 Blade 2 is rigidly mounted at its reduced end upon a hub 5 provided with a longitudinal slot 6 and loosely mounted upon a sleeve 7, having a groove 8 extending longitudinally thereof. One end of the sleeve 7 is also provided with longitudinal slits 8 and 9 to render it resilient, so that it may be made to firmly embrace a bushing 10 by a clamping member 11.

Bushing iO fits into the counterbored end 8 of the sleeve 7 and is firmly secured to the shaftC by any suitable means, such as a set-screw 12 passing through said bushin into a longitudinal groove 13 in the shaft C, Fig. 4..

The members i and al of the narrow blades 3 and 3 are rigidly mounted at their reduced ends upon hubs l4 and 15 having slots 16 and 17, respectively, extending obliquely in opposite directions, as disclosed by Fig. 2.

The members F and -l blades 3 and 3 are rigidly mounted at their reduced ends upon hubs 18 and 19 provided with slots 20 and 21, respectively, extending obliquely in opposite directions.

All of the blade hubs are loosely mounted upon the grooved sleeve 7, but secured from moving longitiulinally of said sleeve by collars and 23 provided with set-screws 24 and 25, respectively, whereby they are firmly secured to the sleeve 7, Fig. 4

26 designates a shifting bar slidably mounted in the groove 8 of the sleeve 7 and provided with upwardly-extendiug lugs 27, 28, 29, 30, 31, the five latter projecting upwardly into the slots (5, 1G, 17, 21, and 20,

-respectively, Figs. 2 and 4, to cause the blade hubs to rotate with the sleeve 7 and also to adjust said blade hubsaxially, as will hereinafter appear.

The lug 27 projects upwardly into an opening 33 in a shifting collar 3l slidably mounted upon the sleeve 7 to move the shifting bar 26 freely, longitudinally, for the )urpose of adjusting the members of the lades 3 and 3, axially, as above-referred to.

The collar 34 is adjusted longitudinally of the narrow 7 by a l."" is ad usted by a screw 359, secured i": th

i at each movement o .ing the. clamping member l T and all the p e Ll L till? wants the sleeve r'od thereby to be rotated upon and the bushing until proper 1- A I A} I is ehectcd. nnen rue. clamping .1 1S again tightened. i the an collar shifts the bar in loinjzitiulinally, causing its lugs .29 to ll inclusiie, to more; through the oblique slo i and Q0, ire-spec rely. and thereby cnla he blades 3 and 3. lVhen a dark p'clurc requiring more ligut is to be exposed, lhe'bladcs 3 and i are contracted by shifting; the collar the lugs :29

ill to the right, thereby nosing to 32 to axially shift the respective hubs tl'u'ough which they slide. in a reverse direction. This enlarging and contracting oi the blades 3 and 3*- may be accomplished throng; i proper manipulation of the screw 38 while pictures are being projected upon a screen. at which. time the operator is better enabled to judge the degree of light required for dillerent pictures. From the foregoing it will be r radily understood, that the proper degree of light for displaying the moving pictures to the best ad 'antagge can be readily obtained at will. As the slot 6 in the nub of the Wide blade 2 is straight instead of being ar'angod obliquely, as are the slots in the companion hubs, the position of said blade 2 upon the sleeve 7 is not ali'ectcd by the movement of the lug from one curl of slot 6 to the other.

As the area of the blade 2 is not atlcrtcd by the enlargement and expansion of the blades 3 and 3. it is obvious that th blade members l" and -l must travel wire the dis tance of the blade members t and l to maintain equal spaces between the blades 2, 3 and 3, consequently the angle ol the slots and 21 is twice as great as the angleof the slots 16 and 1?.

While l have shown and descrilwd a three blade shutter in the present instance. it is to be understood that the number of blades may be increased or diminished as desired. and that other changes falling within the spirit and scope of the claims can he made.

Having thus described my invention, what adapted to be mounted upon a and having blade consisting of a T of members capable of axial ad- 'nenan ind pcmlcnt hub for each memtcnding' into said slots to adjust the lly.

eer adapted to be mounted upon and having a blade consisting of a of members capable of axial adjustment. iinlcpeiulent hubs for said inemlug; oblique slots extending in difns, and means extending into multaneously adjust the hubs oi members capable of axial adindependcnt hubs for said memoblique slots, lugs extending 1l l slots. and means for shifting said jugs adjust the hubs axially.

A shutter adapted to be mounted upon a shalt and. having a blade consisting of a plurality of members apahlc of axial adjustn'ient, independent hubs for said members, *a bar having means engaging said hubs to adjust the same axially, and means for actuating said bar.

It shutter adapted to be mounted upon a shaft and having a blade consisting of a plurality of members *apahle of axial adjustment. independent hubs for said members, a bar lllll'lllg' means engaging said hubs to adjust the same axially, and a lever for actuating said bar. I o. A shutter adapted to be mounted upon a shaft and HH'lHQf a blade consisting of a plurality of members capable of axial adjustment. independent hubs for said members. a bar having in ans engaging said hubs to adjust the same axially, and a grooved sleeve in which said bar is mounted.

7. in combination with a rotary shaft of a moving picture machine, a bushing mountcd upon said shat't. a sleeve mounted upon tho shaft and said bushing and having a longitudinal slot. a shutter mounted upon said slccrc and embodying a blade having a plurality of members capable ol axial ad jusinicnt. and a shillahlc bar slidahlc in the dotted HlccYc and engaging the members of said blade to adjust them axially.

in tcstimony \vhcrcol l allix my signature in the presence of two witnesses.

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